Roof expansion joint

Abstract

A roof expansion joint for flat built up roofs forms an elevated elongated structure bridging an expansion slot-like opening between adjacent roof sections to provide a movable watertight seal therebetween formed of rigid slideably engaged members.

Although but three embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention and having thus described our invention what we claim is: 
     
       1. A roof expansion joint structure for bridging and closing an elongated opening in a roof and comprising spaced upright longitudinally extending members defining said opening, longitudinally extending cants attached to said upright members adjacent their upper ends and extending downwardly and outwardly therefrom so as to engage said roof, a longitudinally extending outturned angular flange on the upper end of one of said cants extending opposite said opening, and a longitudinally extending cover strip having a downturned angular flange on one edge and an inturned angularly disposed flange on its other edge extending toward said opening and positioned on and attached to the other one of said cants and slidably engaged on said outturned angular flange, said inturned angularly disposed flange on the cover strip extending inunder said outturned angular flange on the other cant so as to form a movable weather tight seal across said elongated opening in said roof. 
     
     
       2. The roof expansion joint structure set forth in claim 1 and wherein one of said spaced upright members comprises a wall on one side of said elongated opening and the other upright member is positioned on said roof on the other side of said elongated opening. 
     
     
       3. The roof expansion joint structure set forth in claim 1 and wherein said elongated opening in said roof is located between a pair of adjacent flat roof sections and wherein said upright members are positioned on the adjacent edges of said flat roof sections and wherein said cants are positioned on said flat roof sections and extend upwardly toward and are engaged on said upright members. 
     
     
       4. The roof expansion joint structure set forth in claim 3 and wherein said spaced upright members, cants and said cover strip are elongated sections of rigid material. 
     
     
       5. The roof expansion joint structure set forth in claim 3 and wherein said inturned angular flange on said cover strip is positioned relative to said outturned angular flange to limit vertical separation movement of the same and said outturned angular flange on said cant. 
     
     
       6. A roof expansion joint forming a weather tight movable closure between spaced adjacent sections of a flat roof having roofing material thereon and comprising a pair of longitudinally extending upright members positioned on the adjacent edges of said roof sections, oppositely disposed cant members on said roof sections extending upwardly toward and engaged on said upright members, said roofing material extending upwardly on said cant members, an angle member positioned on said upwardly extending roofing material and secured to one of said cant members with one flange thereof extending outwardly therefrom away from said upright members and a generally horizontally disposed longitudinally extending rigid joint cover having a downturned flange on one of its longitudinal edges and a downturned and inturned flange on its other longitudinal edge and positioned over said upright members, said cant members and said roofing material and said outturned flange of said angle member, fasteners securing the downturned flange of the joint cover to one of said cant members so as to engage said roofing material thereon, the downturned and inturned flange of said joint cover being positioned inwardly and inunder said outturned flange of said angle member on the other of said cant members so as to yieldingly limit the vertical movement therebetween, said rigid joint cover and said outturned flange of said angle member arranged for sealing and sliding movement relative to one another.